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In medium- and high-voltage cable manufacturing, effective electromagnetic interference (EMI) shielding combined with high electrical conductivity is essential for signal stability, fault current handling, and overall system reliability. Copper Tape for Cable — également connu sous le nom de Copper Foil Tape ou Soft-Annealed Copper Shielding Tape — is a high-purity, precision-slit copper foil engineered specifically for the cable industry. Produced from 99.9%+ pure electrolytic tough pitch (ETP) copper and soft-annealed to O temper, it delivers near-100% IACS conductivity, excellent formability, and superior mechanical properties for longitudinal or helical wrapping applications.

As a trusted B2B supplier of complete cable materials and technical solutions with decades of global project experience, we recognize copper tape as the premium choice for manufacturers requiring maximum shielding effectiveness, fault-current capacity, and long-term durability in power cables, XLPE-insulated cables, transformers, and busway systems.

Why Copper Tape Is Specified for Cable Shielding

Copper tape delivers continuous metallic coverage when applied helically with a minimum 10–25 % overlap (typical 12.5–25 % on MV cables). This creates a Faraday-cage effect that equalises the electric field over the semi-conducting insulation screen, suppresses external electromagnetic interference (EMI), and carries short-circuit fault current to the earthing system. In XLPE-insulated cables rated 6–35 kV (IEC 60502-2 constructions), the copper tape screen is applied directly over the extruded insulation screen.

Key performance data (annealed soft temper):

• Conductivity: ≥96–100 % IACS (TU1 ≥100 %, T2 ≥98 %)
• Volume resistivity at 20 °C: ≤0.017–0.0176 Ω·mm²/m
• Tensile strength: 200–300 MPa (soft annealed)
• Elongation: ≥25–35 % (ensures crack-free wrapping on high-speed lines)
• Surface: bright, clean, free of oxide that would impair conductivity or soldering

These values comply with the latest Chinese national standard GB/T 11091-2024 (Copper strip and foil for cables, implemented November 2024) and are consistent with IEC 60502, ASTM B152 and related cable construction requirements.

Composition et procédé de fabrication avancé

Copper Tape for Cable is manufactured from high-purity copper strip that undergoes precision cold rolling, annealing, and slitting. Key characteristics include:

• Base material: Electrolytic tough pitch (ETP) copper with ≥99.9% purity
• Tempérer: Soft-annealed (O temper) for maximum flexibility and wrapability
• Finition de surface: Bright, clean, and burr-free edges for smooth high-speed processing

The tape is available in thicknesses from 0.05 mm to 0.20 mm and widths from 10 mm to 1000 mm, with optional adhesive backing or copolymer coating for enhanced bonding and moisture resistance.

Principaux avantages techniques et gains de performance

Near-100% IACS Electrical Conductivity Copper tape provides the highest conductivity among common shielding materials, enabling excellent EMI/RFI attenuation and low transfer impedance — critical for maintaining signal integrity in sensitive power and communication cables.

Superior Formability & High-Speed Processability Soft-annealed temper combined with high elongation ensures wrinkle-free longitudinal or helical wrapping on high-speed lines without cracking or spring-back, reducing production defects and scrap rates.

Excellent EMI Shielding & Fault-Current Capacity The high-purity copper core delivers near-100% optical coverage and high fault-current carrying capability, making it ideal for metallic shielding layers in MV/HV cables and grounding applications in transformers and busway systems.

Mechanical Strength & Durability

• Tensile strength: High (typically 200–300 MPa in annealed condition)
• Elongation: Excellent (≥30–45%)

These properties ensure the tape withstands mechanical stresses during manufacturing, installation, and service life.

Versatile & Customizable Available in bare, adhesive-backed, or copolymer-coated versions to suit different cable designs, with custom widths and thicknesses for precise matching to your production equipment and performance requirements.

Copper Tape vs. Aluminum Tape for Cable Shielding

Copper Tape vs. Alternative Shielding Methods

Application & Selection Guide for Engineers and Procurement

Primary applications

• Medium-voltage XLPE power cables (6/10 kV to 18/30 kV) – helical copper-tape screen over insulation screen (IEC 60502-2).
• Frequency-conversion (VFD) and special control cables requiring high EMI attenuation.
• Communication, radio-frequency and instrumentation cables where conductivity and solderability matter.
• Transformers, busbars and grounding layers where soft-annealed copper provides both conductivity and formability.

Selection logic

1. Determine system earthing and prospective fault current. Low-to-moderate fault current → copper tape of 0.10–0.15 mm is usually sufficient.
2. Confirm voltage class and insulation type. MV XLPE almost always uses copper tape (or copper wire) metallic screen.
3. Specify temper (soft annealed / O60 preferred for high-speed wrapping) and surface condition (bright, oxide-free).
4. Verify dimensional tolerances against GB/T 11091-2024 or project specification (thickness tolerance typically ±0.005–0.015 mm depending on grade and thickness).
5. For hybrid constructions, copper tape can be combined with a drain wire or outer braid when both coverage and mechanical robustness are required.

Installation and failure-prevention notes

• Maintain minimum overlap (normally ≥12.5 %) and uniform tension during application to avoid gaps or wrinkling.
• Ensure the tape is in continuous electrical contact with the semi-conducting insulation screen; any oxide or contamination raises transfer impedance.
• Terminate the copper-tape screen with a 360° connection or soldered/bonded earth braid at joints and terminations to preserve shielding integrity.
• Avoid sharp bends or repeated flexing after installation; copper tape has lower fatigue life than braid in highly mobile applications.
• Store rolls in dry conditions; surface oxidation reduces conductivity and solderability.

Spécifications techniques

For Shielding of Power Cable

For Transformer and Busway Applications

(Custom thicknesses, widths, and tempers available upon request.)

Normes de fabrication et assurance qualité

Copper Tape for Cable complies with:

• CEI 60502 (Power cables with extruded insulation)
• ASTM B152 (Copper sheet, strip, plate, and rolled bar)

Every batch undergoes rigorous testing for conductivity, mechanical properties, dimensional accuracy, and surface quality to ensure consistent performance and full traceability.

Emballage et logistique

Supplied in rolls with standard inner diameters of 76 mm, 102 mm, or 150 mm. Coils are securely packed in wooden cases or on pallets for safe global transportation and storage.

Premium Conductivity & Shielding for Demanding Cable Applications

Copper Tape for Cable combines near-100% IACS conductivity, superior formability, and excellent EMI shielding performance to deliver a high-reliability shielding and conductive solution for modern power, XLPE, transformer, and busway systems. Its precision engineering and compliance with IEC 60502 and ASTM B152 make it the technical upgrade for manufacturers seeking maximum performance and long-term cable integrity.

For cable manufacturers and EPC contractors focused on qualité fiable, solutions techniques personnalisées, et valeur du partenariat à long terme, this tape ensures your cables meet the highest conductivity and shielding standards while optimizing production efficiency.

Demande d'informations to request detailed technical data sheets, samples, custom specifications, or competitive bulk quotations tailored to your production line and cable designs. Our expert team provides full technical consultation and one-stop material solutions that strengthen your competitive advantage in global cable markets.